CN107834866A - Mining 127V AC powers - Google Patents
Mining 127V AC powers Download PDFInfo
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- CN107834866A CN107834866A CN201711187630.4A CN201711187630A CN107834866A CN 107834866 A CN107834866 A CN 107834866A CN 201711187630 A CN201711187630 A CN 201711187630A CN 107834866 A CN107834866 A CN 107834866A
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- 238000005065 mining Methods 0.000 title claims abstract description 42
- 238000002955 isolation Methods 0.000 claims abstract description 39
- 238000004146 energy storage Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000005856 abnormality Effects 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000013480 data collection Methods 0.000 abstract description 2
- 238000003672 processing method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 13
- 230000005611 electricity Effects 0.000 description 6
- 238000004088 simulation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
Abstract
127V AC powers that the present invention is mining, mainly including A.C. contactor, voltage transformer, current transformer, rectification circuit, high-frequency isolation DC/DC converters, energy-storage module, inverter circuit and digital microprocessor.Using the mining 127V AC powers of said structure, the advantage is that：Being not required to voltage on line side detection can unity power factor operation；Power density height and power supply high-frequency isolation；It is strong to suppress voltage on line side fluctuation ability；Intelligent processing method is realized, output current and AC-input voltage can be sampled, system cuts off rapidly the A.C. contactor of main circuit when more than setting protection value, so as to improve the security of underground coal mine 127V AC powers.Meanwhile the increase of energy-storage module can make AC power remain to the normal work for carrying out a period of time in electric network power-fail again, this is all significant to mine safety production and abnormal data collection.
Description
Technical field
The present invention relates to mine power-supply device, more particularly to a kind of mining 127V AC powers.
Background technology
In coal industry, mining 127V AC powers are always a kind of widely used power supply in China's coal-mine underground, and
And considerably long from now in the period of in, illumination, security monitoring and the information gathering of underground will depend on 127V AC powers.Clothes
It is engaged in being the important guarantee of safe coal production and living in the electric power system of illumination, security monitoring and information gathering, tradition is mining
127V AC power supply systems are mainly made up of the part such as conversion electric power, feed line, partition switch, return wire, and conversion electric power is mostly
It is made up of the protection of Industrial Frequency Transformer concatenation and detection means, its function is single, the operation of non-unity power factor, bulky, prevents
This height, and the rise of line voltage are burst into, falls and harmonic wave can reflect in the outlet side voltage of 127V AC powers, together
When due to the presence of transformer internal resistance so that the output voltages of traditional 127V AC powers changes with the change of load again,
All above mentioned problems make it that the output voltage of traditional 127V AC powers is second-rate.In addition, traditional 127V AC power supply systems
Due to no supporting corresponding energy-storage system, once therefore supply network failure power off, traditional 127V AC power supply systems also do not have
The standby ability for continuing power supply.
On the 127V AC power networks of colliery in addition to lighting apparatus, in addition to various partition switches, Gas Signal report
Alert device, talkback unit and a series of device for controlling etc..Because traditional transformer can not suppress the fluctuation of power network, once overvoltage or
Under-voltage, these equipment can not be operated under rated condition.When main voltage ripple of power network is big, there is high pressure spike, although continuing
Time is very short, but has enough energy to damage these equipment.Meanwhile when being powered to nonlinear load, it is substantial amounts of idle and
Harmonic wave will be injected into power network, seriously pollute power network.Therefore, one kind can eliminate grid fluctuations affect and can and enough realize unit power
Factor is run, and remains to maintain the 127V AC powers of a period of time stable power-supplying after electric network fault powers off, to improving colliery
Safety and effective information collection important in inhibiting, and there is presently no the appearance of this power supply product.
The content of the invention
The purpose of the present invention is to overcome drawbacks described above, design is a kind of have the high quality of power supply, output is stable, unit power because
Number runs and the mining 127V AC powers of a period of time stable power-supplying is can still provide in grid cut-off.
To reach above-mentioned purpose, mining 127V AC powers provided by the invention, including A.C. contactor, mutual induction of voltage
Device, current transformer, rectification circuit, high-frequency isolation DC/DC converters, inverter circuit and digital microprocessor.External AC
Source is connected to rectification circuit through A.C. contactor, and rectification circuit inputs stable DC to high-frequency isolation DC/DC converter circuits primary side
Voltage.DC voltage produces stable isolated DC voltage to energy-storage module and inversion electricity after high-frequency isolation DC/DC converters
Road powers, and finally exports stable exchange 127V power supplys by inverter circuit.Voltage transformer is connected to high-frequency isolation DC/DC converters
The output end of secondary and inverter circuit, current transformer be connected to inverter circuit output loop and A.C. contactor and rectification circuit it
Between, A.C. contactor, voltage transformer, current transformer are connected with microprocessor respectively, the output of high-frequency isolation DC/DC converters
DC voltage (Ud) and inverter circuit ac output voltage (Uout) feedback be connected to digital microprocessor, the control of digital microprocessor
Signal processed is respectively connected to A.C. contactor, rectification circuit and inverter circuit.
127V AC powers that the present invention is mining, the microprocessor, which is provided with, is used for what is carried out data transmission with host computer
RS232 interface or CAN interface.
127V AC powers that the present invention is mining, the rectification circuit are made up of VIENNA rectifier：
Three switch VIENNA rectifiers：By controllable electric power electronic switching device (SA、SB、SC) and fly-wheel diode (VD) structure
Into.
Six switch VIENNA rectifiers：By six electronic power switch device (S±A、S±B、S±C) and fly-wheel diode (VD)
Form.
127V AC powers that the present invention is mining, the rectification circuit are made up of Three-Phase PWM Rectifier：By six power electronics
Switching device (S1-S6) and fly-wheel diode (VD) composition.
The mining 127V AC powers of the present invention, the digital microprocessor are provided with CPU and coupled：
AD conversion module, for the analog signal of voltage transformer summation current transformer to be converted into data signal；
PWM drive modules：For electric to VIENNA rectifier (switch of three switch/six) or Three-Phase PWM Rectifier and inversion
Road electronic power switch device output PWM trigger signals；
Protection module, for judging to exchange whether the output of 127V power supplys deposits excessively stream, overvoltage or the abnormality such as under-voltage, and it is defeated
Go out control signal shut-off PWM module and A.C. contactor；
Communication module：For the information such as voltage, electric current and power to be uploaded into host computer, carry out information monitoring and read
Position machine instruction.
127V AC powers that the present invention is mining, the high-frequency isolation DC/DC converters are by the individual full control H of M (M=1,2,3 ...)
Bridge and individual diode rectifier bridge and high frequency transformer M the levels input series and output parallel of M (M=1,2,3 ...) are formed, and energy unidirectionally flows
It is dynamic.
127V AC powers that the present invention is mining, the high-frequency isolation DC/DC converters are by the individual full control H of 2N (N=1,2,3 ...)
Bridge and the individual high frequency transformer M levels input series and output parallel of N (N=1,2,3 ...) are formed, energy in bidirectional flow.
127V AC powers that the present invention is mining, the frequency isolates DC/DC converter drive signals, by high frequency pulse generator
Produce, form opened loop control.
127V AC powers that the present invention is mining, the rectification circuit, DC voltage is exported by high-frequency isolation DC/DC converters
(Ud) DC feedback voltage is used as, the control of two-stage circuit one-level is formed, the control can reach：
AC unity power factor is run；
High-frequency isolation DC/DC converters (5) output stable DC voltage (Ud)。
The mining 127V AC powers of the present invention, the energy-storage module, by ultracapacitor, battery or ultracapacitor and
Battery mixing is formed.
127V AC powers that the present invention is mining, the inverter circuit, by the individual single-phase full control H bridges of Z (Z=1,2,3 ...) or Z (Z
=1,2,3 ...) individual three-phase full-controlled bridge is formed.
The advantages of mining 127V AC powers of the invention and good effect are：Because there is provided A.C. contactor, voltage
Transformer, current transformer, rectification circuit, high-frequency isolation DC/DC converters, energy-storage module, inverter circuit and digital microprocessor
Device, thus be not required to voltage on line side detection can unity power factor operation；Power density height and power supply high-frequency isolation；Suppress net side
Voltage pulsation ability is strong, when live main voltage ripple of power network, the dutycycle of pulse is exported by adjusting, realizes alternating voltage
Stable output, stable 127V alternating voltages are provided to enterprise's production and user.
Meanwhile using digital microprocessor and host computer, realize intelligent processing method, can to output current with exchange input
Voltage is sampled, and system cuts off rapidly the A.C. contactor of main circuit when more than setting protection value, so as to improve coal mine
The security of lower 127V AC powers.Meanwhile the increase of energy-storage module can remain to normal progress one in electric network power-fail again
The work of section time, this is all significant to mine safety and abnormal data collection.
It is described in detail referring to the drawings below in conjunction with embodiment.
Brief description of the drawings
Fig. 1 is the block diagram of the mining 127V AC powers of the present invention；
Fig. 2 is the circuit theory diagrams of Three-Phase PWM Rectifier；
Fig. 3 is the circuit theory diagrams of three switch VIENNA circuits in embodiment；
Fig. 4 is the circuit theory diagrams of six switch VIENNA circuits；
Fig. 5 is the high-frequency isolation DC/DC converter M level input series and output parallel schematic diagrames of energy one-way flow；
Fig. 6 is the high-frequency isolation DC/DC converter N level input series and output parallel schematic diagrames of energy in bidirectional flow；
Fig. 7 is energy one-way flow and M=1 high-frequency isolation DC/DC converter circuit schematic diagrams in embodiment；
Fig. 8 is single-phase PWM inverter circuit Z level input-series and output-parallel schematic diagrames
Fig. 9 is three-phase PWM inverter circuit Z level input-series and output-parallel schematic diagrames
Figure 10 is Single-phase PWM Inverter circuit theory diagrams in embodiment；
Figure 11 is the equivalent circuit schematic of VIENNA circuits in embodiment；
Figure 12 is the one circle control schematic diagram of VIENNA circuits in embodiment；
Figure 13 is the A phases input voltage and current waveform figure of new type mining 127V AC powers in embodiment；
Figure 14 is the three-phase current input waveform figure of new type mining 127V AC powers in embodiment；
Figure 15 is the high-frequency isolation DC/DC converter output voltage waveforms of new type mining 127V AC powers in embodiment
Figure；
Figure 16 is the output waveform figure of new type mining 127V AC powers in embodiment.
Embodiment
A kind of present invention implementation of mining 127V AC powers is provided here, describes this hair in detail below in conjunction with the accompanying drawings
The embodiment of bright mining 127V AC powers.
Embodiment：
Reference picture 1,127V AC powers that the present invention is mining, including A.C. contactor (1), voltage transformer (2), electric current are mutual
Sensor (3), VIENNA rectification circuits (4), high-frequency isolation DC/DC converters (5), energy-storage module (6), inverter circuit (7), numeral
Microprocessor (8) and host computer (9).External AC power supply is connected to VIENNA rectification circuits (4) through A.C. contactor (1),
VIENNA rectification circuits (4) input stable DC voltage to high-frequency isolation DC/DC converter circuits (5) primary side.Hereafter, high frequency every
Produce DC voltage that is stable and isolating with primary side from DC/DC converters (5) secondary, the DC voltage to energy-storage module (6) and
Inverter circuit (7) is powered, and stable exchange 127V voltages are finally exported by inverter circuit (7).Voltage transformer (2) is connected to high frequency
Isolate the secondary of DC/DC converters (5) and the output end of inverter circuit (7), it is defeated that current transformer (3) is connected to inverter circuit (7)
Go out between loop and A.C. contactor (1) and VIENNA rectification circuits (4), A.C. contactor (1), voltage transformer (2), electric current
Transformer (3) is connected with microprocessor (8) respectively, high-frequency isolation DC/DC converters (5) output DC voltage (Ud) and inversion electricity
Road (6) ac output voltage (Uout) feedback be connected to digital microprocessor (8), the control signal of digital microprocessor (8) connects respectively
To A.C. contactor (1), VIENNA rectification circuits (4) and inverter circuit (7).
Rectification circuit (4) can be made up of PWM rectifier or VIENNA rectifier, wherein PWM rectifier as shown in Fig. 2
By six electronic power switch device (S1-S6) and fly-wheel diode (VD) composition.This example is using VIENNA rectifier form as schemed
3, VIENNA rectifier can use two kinds of circuit forms：Refering to Fig. 3, in the first VIENNA rectification circuit (4), circuit by
Controllable electric power electronic switching device (SA、SB、SC) and fly-wheel diode (VD) composition；Refering to Fig. 4, in second of VIENNA rectification
In circuit (4), circuit is by controllable electric power electronic switching device (S±A、S±B、S±C) and fly-wheel diode (VD) composition, above electric power
The triggers circuit of electronic switching device is still controlled by digital microprocessor (8), and rectification and voltage regulation function are realized in this circuit arrangement.
High-frequency isolation DC/DC converters (5) can use two kinds of circuit forms：Refering to Fig. 5, in the first high-frequency isolation
In DC/DC converters (5), circuit is by controllable electric power electronic switching device (K1-K8), fly-wheel diode (VD), commutation diode
(VDZ) and high frequency transformer composition basic module, the connection of M (M=1,2,3 ...) level is carried out in a manner of input series and output parallel；
Refering to Fig. 6, in second of high-frequency isolation DC/DC converter (5), circuit is by controllable electric power electronic switching device (K1-K8), it is continuous
Flow diode (VD) and high frequency transformer composition basic module, carried out in a manner of input series and output parallel N (N=1,2,
3 ...) level connects.The high-frequency isolation DC/DC converters (5) that this example uses such as Fig. 7, circuit diagram when being M=1 in Fig. 5.With
The triggers circuit of upper electronic power switch device is made up of high frequency pulse generator, opened loop control, and high-frequency isolation function is electric herein
Realized in road.
Inverter circuit (7) can use two kinds of circuit forms：Refering to Fig. 8, the first is single-phase PWM inverter circuit, circuit
By controllable electric power electronic switching device (S1-S4) and fly-wheel diode (VD) composition basic module, form Z levels input Parallel opertation
Series connection；Refering to Fig. 9, in second of three-phase PWM inverter circuit, circuit is by controllable electric power electronic switching device (S1-S6) and afterflow
Diode (VD) forms basic module, forms Z level input-series and output-parallels.The inverter circuit (7) that this example uses such as Figure 10, it is
Circuit diagram in Fig. 8 during Z=1.The triggers circuit of above electronic power switch device is still controlled by digital microprocessor
(8), inversion function is realized in this circuit arrangement.
Digital microprocessor (8) is provided with CPU and coupled following modules：
AD conversion module, for the analog signal of voltage transformer (2) summation current transformer (3) to be converted into digital letter
Number；
PWM drive modules：For to controllable electric power electronic switching device (SA、SB、SC) and inverter circuit electronic power switch
Device exports PWM trigger signals；
Protection module, for turning off PWM module and A.C. contactor (1) in overvoltage or excessively stream；
Comparison module：For judging to exchange whether 127V outputs deposit excessively stream, overvoltage or the abnormality such as under-voltage, and export control
Signal processed is to time block and protection module.
In the embodiment of the mining 127V AC powers of the present invention, digital microprocessor (8), which is additionally provided with, to be used for and host computer
(9) RS232 interface carried out data transmission.
Describe the course of work for inventing mining 127V AC powers in detail below in conjunction with the accompanying drawings：
The course of work of two-rank module one-level control is analyzed first：
Two kinds of topologys in the Vienna of three-phase three-wire system are completely the same in principle and running status, simply controlled with one
Device instead of two fly-wheel diodes, therefore be analyzed exemplified by the first, and the Vienna topology of three-phase three-wire system is such as Fig. 3 institutes
Show, e in figureA、eB、eCFor rectifier three-phase input supply voltage；iLA、iLB、iLCFor three-phase input current；LA、LBAnd LCRespectively
Three-phase input filter inductance and equal in magnitude, i.e. LA=LB=LC=L；Cf1、Cf2For DC side filter capacitor, and capacitance size phase
Etc. being Cf；U0For DC side output voltage；RLFor direct current output lateral load；Qa、Qb、QcFor three work(corresponding to A, B, C three-phase
Rate switching tube, corresponding dutycycle are dA、dB、dC.Ignore the shadow of the switching loss of switching device, conduction voltage drop and distributed constant
Ring, its equivalent model is as shown in figure 11.U in figureAN、uBNAnd uCNCycle for the midpoint at rectifying bridge arm midpoint to output capacitance puts down
Equal voltage.
When the working frequency of converter is far longer than the fundamental frequency of three phase mains, converter under quasi-steady state pattern,
I.e. in multiple adjacent switch periods, three-phase main-frequency input voltage can be equivalent to DC input voitage.In view of AC
Filter inductance meet voltage-second balance principle in a cycle of converter, can be obtained based on conditions above：
Wherein uAO、uAOAnd uAORespectively cycle average voltage of the rectifying bridge arm midpoint to three-phase input power supply midpoint.
Because the working frequency of converter is very high, and filter inductance inductance value very little itself, it can now ignore inductance and obtain：
In three-phase equilibrium without in neutral system：
eA+eB+eC=0 (3)
It is apparent from by Figure 11：
Wherein uNOFor the cycle average voltage at the midpoint at three-phase input power supply midpoint to output capacitance.
It can be obtained by formula (2), (3) and formula (4)：
It can be obtained by formula (3) and formula (5)：
Cycle average voltage u of the rectifying bridge arm midpoint to the midpoint of output capacitanceAN、uBNAnd uCNIt can be expressed as：
Wherein sign () is sign function, by taking A phases as an example, is then had：
Simultaneous formula (6) and formula (7) obtain：
The core of unity power factor is so that the voltage of converter AC keeps same-phase with electric current, you can with from friendship
Regard converter as an equivalent resistance R in stream sidee, then have：
Because the coefficient matrix in formula (9) is singular matrix, therefore equation does not have unique solution, and one group of solution therein is：
Wherein RsFor the sampling resistor of current sensor；Um=U0Rs/(2Re) be voltage controller stable state output quantity.
According to formula (11) the core governing equation of one circle control is：
One circle control system uses Double closed-loop of voltage and current, wherein outer shroud sampling and outputting voltage and carries out closed loop control
System, voltage regulator output signal produce carrier signal as carrier amplitude and by carrier generation circuit.Wherein carrier wave generation electricity
Road can form realization by analog devices such as the integrator with reset, impulse generators.Equal proportion sampling rectifier three-phase input phase
Electric current, and input phase current signal is taken absolute value, the signal is mutually completed a business transaction to obtain directly as modulated signal with carrier signal
The duty cycle control signal of each switching tube.
In order to improve control efficiency and reduce high pressure lateral capacitance, this paper presents one kind to be based on rectification stage-high-frequency isolation DC-
DC coordination control strategies, the strategy is with fixed duty cycle opened loop control high-frequency isolation DC-DC circuit, now high-frequency isolation DC-DC
Converter can be equivalent to a proportional component with proportionality coefficient k relevant with dutycycle and transformer voltage ratio, high-frequency isolation
The original edge voltage of DC-DC converter is with secondary voltage relation：
Ud=kUo (13)
Therefore, by controlling high-frequency isolation DC-DC outlet side voltages can to control Vienna circuit direct side voltage, this
Kind control mode not only enormously simplify control structure, but also can greatly reduce Vienna converter DC output side electricity
Hold.Figure 12 is the system control block figure based on the control mode.
In addition for inverter circuit, including the single-phase full bridge inverter circuit that this example uses, its control technology and principle are
It is quite ripe, therefore do not repeating herein.
In order to confirm the validity of the circuit, circuit is emulated with reference to industrial reality, its major parameter such as institute of table 1
Show.
Table 1 emulates major parameter
Tab.1 Simulation of the main parameters
Its simulation data waveform is supported at 0.2 second and added by semi-load as shown in Figure 13, Figure 14, Figure 14, Figure 15 and Figure 16
It is extremely fully loaded.Figure 13 is A phase currents and A phase simulation waveforms, it can be seen that system is run for unit power factor；Figure 14 is three-phase electricity
Simulation waveform is flowed, is 120 degree of three phase sine mutual deviation, it is known that system integrally all runs on unity power factor；Figure 15 be high frequency every
From DC/DC converter output terminal voltages.Suppress well it can be seen that having for load disturbance, power network is not polluted, scheme
16 be inverter voltage, it can be seen that all has good stability in the fully simulated cycle.
127V AC powers that the present invention is mining, it is not necessary to detect the three-phase alternating voltage of input, it is defeated only to detect three-phase alternating current
Enter electric current to adjust the dutycycle of output pulse, so as to realize the ac-dc conversion under unity power factor, and export one kind
The stable AC powers of 127V isolated with power network.Using digital microprocessor and host computer, it is convenient to the output electricity to system
Pressure and power down protection time are set, and realize intelligentized control method, the dependable with function of system greatly improves.
Inverter circuit output voltage, output current and voltage are sampled using microprocessor, when any one detects
Value crosses setting protection value, and system can cut off the A.C. contactor of main circuit rapidly, so as to realize excessively stream and overvoltage protection, greatly
The big security for improving colliery illumination and detecting system.
In addition, microprocessor can pass to the data parameters detected host computer, data can be passed through liquid crystal by host computer
Display shows or uploaded to overall control center, can be with sound and light alarm when there is protection failure, and records the time of failure generation
Fault type and fault value at that time.Because these are known technology, repeat no more here.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to the structure of the present invention
Think and scope is defined, under the premise of design of the present invention is not departed from, ordinary skill technical staff is to this hair in this area
The all variations and modifications that bright technical scheme is made, protection scope of the present invention, the claimed skill of the present invention all should be fallen into
Art content, all record in detail in the claims.
Claims (11)
- A kind of 1. mining 127V AC powers, it is characterised in that：It is mutual including A.C. contactor (1), voltage transformer (2), electric current Sensor (3), rectification circuit (4), high-frequency isolation DC/DC converters (5), energy-storage module (6), inverter circuit (7), digital microprocessor Device (8) and host computer (9).External AC power supply is connected to rectification circuit (4) through A.C. contactor (1), and rectification circuit (4) is to high frequency Isolate DC/DC converter circuits (5) primary side input stable DC voltage.Hereafter, high-frequency isolation DC/DC converters (5) secondary produces DC voltage that is raw stable and isolate with primary side, the DC voltage to energy-storage module (6) and inverter circuit (7) power supply, finally by The stable exchange 127V voltages of inverter circuit (7) output.Voltage transformer (2) is connected to the pair of high-frequency isolation DC/DC converters (5) Side and inverter circuit (7) output end, current transformer (3) be connected to inverter circuit (7) output loop and A.C. contactor (1) with it is whole Between current circuit (4).A.C. contactor (1), voltage transformer (2), current transformer (3) are connected with microprocessor (8) respectively, High-frequency isolation DC/DC converters (5) output DC voltage (Ud) and inverter circuit (6) ac output voltage (Uout) feed back to number Word microprocessor (8), the control signal of digital microprocessor (8) are respectively connected to A.C. contactor (1), rectification circuit (4) and inverse Become circuit (7).
- 2. mining 127V AC powers according to claim 1, it is characterised in that：The microprocessor (8), which is provided with, to be used for The RS232 or CAN interface carried out data transmission with host computer (9).
- 3. mining 127V AC powers according to claim 1, it is characterised in that：The rectification circuit (4) is by VIENNA Rectifier is formed：Three switch VIENNA rectifiers：By controllable electric power electronic switching device (SA、SB、SC) and fly-wheel diode (VD) composition.Six switch VIENNA rectifiers：By six electronic power switch device (S±A、S±B、S±C) and fly-wheel diode (VD) structure Into.
- 4. mining 127V AC powers according to claim 1, it is characterised in that：The rectification circuit (4) is by three-phase PWM Rectifier is formed：By six electronic power switch device (S1-S6) and fly-wheel diode (VD) composition.
- 5. the mining 127V AC powers according to claim 1,3 or 4, it is characterised in that：The digital microprocessor (8) Provided with CPU and coupled：AD conversion module, for the analog signal of voltage transformer (2) summation current transformer (3) to be converted into data signal；PWM drive modules：For electric to VIENNA rectifier (switch of three switch/six) or Three-Phase PWM Rectifier and inverter circuit Power electronic switching device exports PWM trigger signals；Protection module, for judging to exchange whether the output of 127V power supplys deposits excessively stream, overvoltage or the abnormality such as under-voltage, and export control Signal shut-off PWM module processed and A.C. contactor (1)；Communication module：For the information such as voltage, electric current and power to be uploaded into host computer, carry out information monitoring and read host computer Instruction.
- 6. the mining 127V AC powers with VIENNA rectifier according to claim 1,3 or 5, it is characterised in that： The high-frequency isolation DC/DC converters (5) are by the individual full control H bridges of M (M=1,2,3 ...), M (M=1,2,3 ...) individual diode rectification Bridge and high frequency transformer M levels input series and output parallel are formed, energy one-way flow.
- 7. the mining 127V AC powers with PWM rectifier according to claim 1,4 or 5, it is characterised in that：It is described High-frequency isolation DC/DC converters (5) are by the individual full control H bridges of 2N (N=1,2,3 ...) and N (N=1,2,3 ...) individual high frequency transformer N levels Input series and output parallel is formed, energy in bidirectional flow.
- 8. the mining 127V AC powers according to claim 1,6 or 7, it is characterised in that：The high-frequency isolation DC/DC becomes Parallel operation (5) drive signal, is produced by high frequency pulse generator, forms opened loop control.
- 9. the mining 127V AC powers according to claim 1,6,7 or 8, it is characterised in that：The rectification circuit (4), By high-frequency isolation DC/DC converters (5) output DC voltage (Ud) DC feedback voltage is used as, form two-stage circuit one-level control System, the control can reach：AC unity power factor is run；High-frequency isolation DC/DC converters (5) output stable DC voltage (Ud)。
- 10. mining 127V AC powers according to claim 1, it is characterised in that：The energy-storage module (6), by super Capacitor, battery or ultracapacitor and battery mixing are formed.
- 11. mining 127V AC powers according to claim 1, it is characterised in that：The inverter circuit (7) is by Z (Z= 1,2,3 ...) individual single-phase full control H bridges or the individual three-phase full-controlled bridges of Z (Z=1,2,3 ...) are formed.
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| CN201711187630.4A CN107834866A (en) | 2017-11-24 | 2017-11-24 | Mining 127V AC powers |
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| CN201711187630.4A CN107834866A (en) | 2017-11-24 | 2017-11-24 | Mining 127V AC powers |
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| CN108808838A (en) * | 2018-06-21 | 2018-11-13 | 常熟瑞特电气股份有限公司 | More power module control method for coordinating of high-frequency isolation warship AC power |
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| CN113162213A (en) * | 2021-03-05 | 2021-07-23 | 阳光电源股份有限公司 | Uninterrupted power source and energy storage system |
| CN113452277A (en) * | 2020-08-28 | 2021-09-28 | 苏州博思得电气有限公司 | Power module for pulse power generation device and pulse power generation device |
| US11762039B2 (en) | 2019-03-11 | 2023-09-19 | Crouzet Automatismes | Electrical installation comprising a monitoring module |
| US11914002B2 (en) | 2019-03-11 | 2024-02-27 | Crouzet Automatismes | Electrical installation comprising a monitoring module |
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| CN113452277A (en) * | 2020-08-28 | 2021-09-28 | 苏州博思得电气有限公司 | Power module for pulse power generation device and pulse power generation device |
| CN112510967A (en) * | 2020-11-30 | 2021-03-16 | 国网陕西省电力公司电力科学研究院 | High-power combined type sine wave isolation variable frequency power supply system and working method |
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